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Inquiry on the Source of Parasitic Inductance Parameters in Wolfspeed LTspice Module Models

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jlayf
jlayf Contributor Level 1
edited February 24 in Module Products

Dear Wolfspeed Technical Support Team,

Hello,

I am currently using Wolfspeed LTspice power module SPICE models (PRD-07913) for switching transient and layout-related analysis.

I understand from the documentation that the package-level models include detailed parasitic elements, and that these parameters are intended to represent the internal module parasitics.

However, I could not find a description of the data source for these parasitic inductance values in the official models. At a high level, could you please clarify whether the default parasitic parameters in the LTspice power module models are obtained mainly from:

  • 3D electromagnetic simulations of the module package (for example, Q3D or similar tools),
  • Experimental measurements using dedicated test fixtures on physical modules.

I am not requesting specific parameter values or proprietary modeling details. Understanding whether the internal parasitic parameters are primarily simulation-based or measurement-based would be very helpful for assessing model applicability and for aligning the model with our system-level parasitics.

Thank you very much for your time and support.

Best regards,

jlayf

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Comments

  • Forum_Moderator
    Forum_Moderator Wolfspeed Employee - Contributor Level 5
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    Thank you for your post, it has been approved and we will respond as soon as possible.

  • ChrisN
    ChrisN Wolfspeed Admin - Contributor Level 4
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    Hello jlayf,

    We use a combination of experimental measurements and simulation. For parasitic elements that can be measured experimentally, we measure them using an Keysight Technologies E4990A impedance analyzer and precision fixturing such as Keysight Technologies 42941A and Keysight Technologies 16047E fixtures. More information about these measurements can be found in the Wolfspeed application note titled "Measuring Stray Inductance in Power Electronics Systems" (PRD-08710). We then use these experimental measurements to validate our simulation models so we have confidence in our models.

    For parasitics that cannot be measured experimentally (such as inductances that cannot be completely isolated from the influence of other inductances), we use Ansys Q3D to simulate the values. Note, as mentioned above, these models are first validated using the experimental measurements before simulating the unknown parasitics. This approach gives us a high-level of confidence with the simulated values.

    Thanks,

    Chris N.

  • ChrisN
    ChrisN Wolfspeed Admin - Contributor Level 4
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    Hello jlayf,

    I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.

    Thanks,

    Chris N.

This discussion has been closed.